I have been a Toastmaster for several years. This book pulled my experiences together, and showed me how to make better use of preparation and presentation techniques. Carnegie addresses the whole person, and radiates an interest in people and their goals.
Two of the more valuable approaches of the book were its focus on the gradual development of a speech through the use of constant reflection, and its instruction for using imagery to recall the points of a speech when you are actually out on the floor.
Another strong point of the book is its use of examples, both from historical and comtemporary (for the author) sources. The examples not only strengthen the interest of the reader, but augment and reinforce the points Carnegie is emphasizing.